(N0 Model.)

_

2Sheets-Sheet 1-.

A. K. BATON.

Telephone. No. 237,838._

Patented Feb. f5, 188|.

F/6.5

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W/T/VESSES.

(No Mo'del.)

2 Sheets-Sheet 2.

A. K. BATON.

Telephone No. 237,838.

Patented Feb. 15,1881.

vUi'vITED ¿STATES Pivrl'zivîrA OFFICE. l ASAHEL~K. EATON, OF BROOKLYN, NEW YORK, lASSIGNOR TO EATON TELEPHONE COMPANY, OF NEW YORK.

-FELEPHONE. SPECIFICATION forming eert efl Lettere Patent Ne. 237,838, dated February 15, 1881. Application filed November 20, 1880. (No model.)

To all whom it may concern:

but this falls far~short of the action of the spi- -

Be it known that I, ASAHEL K. EATON, ot' ral bar E, Fig..3. This core l make ot' a spi-i

Brooklyn, New York, have invented a new ral closely wound, so that its successive turns and useful Telephone, of which the following are in absolute contact. The material ispret'f

1s a specification.

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erably annealed piano»wire. By this last del My invention relates to the construction ot' vice I obtain results that are very clear and 55 ’ an electro-magnetic telephone in which is in distinct, and louder than when I use the ordi. volved the principle of the expansion and con nary magneto - telephone as a receiver. I traction of an iron or steel rod, or its equiva have found that this apparatus may be also IO lent, or by the making or breaking by the in used as a transmitter. Its action in this re crease or diminution of the electric current

speen-is cxplainable on the supposition that y, carried around the rod, as hereinafter de -the {fibrations of theplate I), which are pro- '

it

scribed. I etl'ect this by means of different duced »by the impingement ot' the airwaves, are concentrated at the point where the plate panying drawings. " is in contact with the core, and by setting up Figure 1 represents one of thesimplest forms a molecular disturbance in the bar act to vary 65

forms of apparatus, illustrated in the accom

,_Q_f„_th_i_s invention, and consists of' a solid soft the current flowing through the coil F. iron or steel bar, E, inclosed in a helix, F, ot' lIn Fig. 4 is shown a modification of my in insulated wire. The plate D is of hard rub vention inwhich I use the form of a multipo ber, mica, wood', or anynon-magneticmaterial. lar magnet for which I received -Letters Pat A magnet-diaphragm, or one capable ot' in ent dated May28,l878. [n this case, also, the

ducing magnetism, is wholly unnecessary, but cores may be solid and in direct contact with

of course may be used, its action being strictly the non-magnetic diaphraglmor, as here shown, mechanical. they may consist of closely-wound spirals con 25

It will be seen that thecentral bar is in di structed as before described. 75 rect contact with the diaphragm. “Then desired, several spirals within the The principle involved in this instrumentis same coil may be used. In such a case they the one discovered by Professor Page-t'. c., may be arranged in contact with the plate and - „nat when an electric current is allowed to now in close contiguit-y, or they may be arranged

30 through acoil which includes a soft iron or

one Within the other, and their ends may abut

steel core the core expands and contracts in length as the current is made or broken, pro

attached to a common block or piece, against

ducing a distinct click. I ñnd that it is not essential that there 35 should be an absolute make-and-break action ofthe current, but that any modification of the'strength of the current will make itself heard in the central bar.

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separately against the diaphragm, or may be which the diaphragm rests. I do not claim, broadly, a wire spiral as the core of the telephone-coil when arranged to impart movement to a diaphragm; nor do I

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claim to be the ñrst to communicate move

ment to a plate or diaphragm mechanically

The diaphragm D is actuated directly by from the core oi' an electro-magnet, -inasmuch the pressure of the core upon its center, and as this has vheretofore been done; but in all 90

repeats any sounds-such as vocal or instru

mental music or articulate speech-transmit

cases ot’ which I am aware intermediate parts have been used between the core and the non

ted to it through any of the diñlerent forms ot’ magnetic plate. ' transmitting apparat-us in use. The Reiss l am aware thatthecore of amagnet hasbeen 45 transmitter operates the instru men t quite satis extended in the form of'a recurved spring bent 95

factorily. The form described, however, is around over the solid core and a non-mag the first and simplest produced, and has given netic diaphragm attached to the flat side of

place to others of a better character. said spring. I am also aware that the core The bar E, Fig. 2, made up of tine iron has been provided with an enlargement made wires, acts more eiï'ectually than the solid core ; in the form of atlanged head or disk, the pro

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237.838'

jecting ñange or head resting in contact with coil or helix inclosing a. closely-wound spiral

a magnetic diaphragm or` armature, so as to of magnetizable'material the successive turns leave a space for the to-and-fro movement ot' of which’ are in contact, substantially as de

,25 ' the diaphragm at, its center. .I am aware, scribed.. ` 3. The combination, in a telephonie re- . that an open spiral to which is attached 5 also, . a diaphragm has been used as the core of a ceiver, of a magnetizing-coil, an inclosed spi

ma‘gnet. In all these devices the eonstruc~ ral closely wound, sothat its successive turns "tion is such that there is bodilyÍ movement to are in contact, and a sounding-plate, against and fro of the parts in -response to magnetic which the end ot' said spiral impinges, sub 30 . attraction, whereas in my device I depend sim stantially as described. ply upon the linear expansion and contraction l 4. An electro-magnet whose coìluor'helix

.of the core due to the molecular changes con

sequent upon magnetization and demagnetiza ‘ tion, as before explained.

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embracesa closely-wound spiral the succes sive turns of vwhich are in contact, `substan tially as described. »

In testimony whereof I añix my signature in What I claim as my invention is I5 '1. The combination of a niagnetizing coil or presence of two Witnesses. helix, a central rod orv bar, and aplate of non ASAHEL K. EATON. magnetic material transverse to said bar and Witnesses: ' in direct and solid contact with the end there H. 0.*ToWNsEND, 2o of. JOHN J. DIFFLEY. 2. In a telephonie receiver, amagnetizing

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